Blank for hammer-handles.



PATENTBD JUNE16, 1903.

A. J. BOUGHT Y. BLANK FOR HAMMER HANDLES. APP LLLL m HHHHHHH ua. 4444 09'.

UNITED STATES Patented June 16,1903.

' ATENT FFICE.

ALFRED J. DOUGHTY, OF ST. LOUIS, MISSOURI, ASSIGNOR, BY MESNE ASSIGNMENTS, TO CHICAGO PNEUMATIC TOOL COMPANY, A COR- PORATION OF NEIV JERSEY.

BLANK FOR HAMMER-HANDLES.

SPECIFICATION forming part of 7 Letters Patent No. 7 30,887 dated June 16, 1903.

Application filed August 4,1899.

To all whom, it may concern.-

Be it known that I, ALFRED J. DOUGHTY, a citizen of the United States of America, residing at the city of St. Louis, in the State of Missouri, have invented a certain new and useful Blank for Hammer-Handles, of which the following is a description, reference being had to the accompanying drawings, forming part of this specification.

My invention relates more particularly to a novel blank for pneumatic-hammer handles composed of a grasping portion or handle proper, an attaching portion for connecting the handle to the cylindrical body of the tool, and an intermediate curved connecting portion or neck, and in which an air-inlet passage or duct extends entirely through the handle and neck portions for the admission of a motive fluid to the tool from a supplypipe connected to the handle. Such handles are shown, for instance, in Letters Patent of the United States No. 549,102 and No. 575,589, granted to Joseph Boyer November 5, 1895, and January 19, 1897, respectively. The Boyer pneumatic hammers shown and described in these patents, including the handles referred to, have gone into extensive use; but great difliculty has been experienced in making the handles of them. Heretofore until recently said handles have been made of malleable-iron castings and have had the air-inlet passage formed in them by coring. Owing to the peculiar shape of the handle and to the fact thata comparatively large passage with comparatively thin walls (particularly in the neck portion of the handle) is required, great care has been necessary in the manufacture of the handles, and even when such care has been exercised a great many defective castings are produced. Inasmuch as the air-inlet passage through the handle is required to convey motive fluid to the tool under a high pressure, frequently exceeding one hundred pounds to the square inch, it follows that a perfect casting is required for the production of a satisfactory handle. Under the conditions above described the production of such handles has heretofore been very troublesome and expensive, owing to the Serial No. 726,104:- (No model.)

loss of a large proportion of defective castings; but notwithstanding such fact all manufacturers of tools having such handles have, I believe, heretofore made such handles of malleable-iron castings, except, perhaps, a few made of brass. The preferable method of forming such blanks consists in drop-forging the handle-blank or solid handle from steel in approximately straight form,then drilling the air-inlet passage in said blank or solid handle while remaining in such approximately straight form, then heating the forging to the proper degree for bending, and then bendingit into the desired handle shape and completing it ready for attachment to the tool, all as will be now described by reference to the accompanying drawings, wherein the preferable form of blank is shown, and in which Figure 1 represents the drop-forged steel blank or solid handle; Fig. 2, a middle longitudinal section thereof after the air-passage has been drilled in the same; Fig. 3, a View corresponding to Fig. 2'after the valve-chamber and supply-pipe connection have been formed in the grasping portion of the handle and the attaching end of the handle finished ready for connection to the body of the tool, and Fig. 4 a middle vertical section of the completed handle.

The same letters of reference are used to indicate identical parts in all the views. In Fig. 1, A represents the grasping portion of the handle-blank, B the end which is formed into the attaching portion, and O the intermediate connection neck portion. Upon the end of "the portion A is formed a boss 0., which is bored out and interiorly threaded in the completed handle to form a suitable connection for the nipple or coupling of the supply-pipe. The end B of the handle-blank in the forging of Fig. 1 consists of a solid cylindrical block. 7

To complete a handle from the blank shown in Fig. 1, a straight air-passage D is drilled therein, as shown in Fig. 2, which is shown as directed inward from the end B of the blank. The handle-blank may now be bent into handle form, Fig. 4, and the handle afterward completed, as shown in said figure, or the work indicated in Fig.3 maybe done upon the blank of the handle before it is bent into handle shape. Such Work consists in boring out the valve-chamber E from the end of the handle opposite that into which the air-passage D was drilled, such valve-chamber intersecting the air-passage D, as shown, and completing a passage-way entirely through the handle, boring out the supply-pipe connection F and interior-1y threading it, and completing the attaching end B of the han-. dle, as shown, consisting, chiefly, in boring out and interiorly threading it and cutting a circular groove in the base of its interior chamber, which groove is intersected by the air-passage D. The outer end of the passage D is permanently closed by a plug 0, driven into a suitable recess formed to receive it.

The straight blank of Figs. 2 and 3 is heated to the proper degree for bending and bent into the shape shown in Fig. 4, after which passages 12 are drilled in the portion B. The handle may then be equipped with a throttlevalve of any suitable type, which will complete the handle ready for attachment to the tool.

While my invention relates more particularly to drop-forged blanks, some of the advantages of my invention may be obtained by casting the blank or solid handle of Fig. l of steel, which in producing the completed handle could be subsequently treated by drilling the passage-way D in it, as shown in Fig. 2, or completing it as far as shown in Fig. 3 and then heating it to the proper degree for bending and bending it into handle shape, as in Fig. 4; but the handles which I have made and put into successful and extensive use, as heretofore stated, have been produced by drop-forging and are superior to those which may be produced from steel castings.

Having thus fully described myinvention, I claim- 1. The herein-described blank for hammerhandles, comprising a grasping portion, an attaching portion, and a neck portion substantially in line, said blank having a substantially straight air-passage extending from the attaching portion through the neck to the grasping portion, and said blank being adaptsubstantially straight air-passage, extendingfrom the attaching portion through the'neck portion into the grasping portion, said grasping portion having a valve-chamber therein, at an angle to and connecting with said airpassage,said attaching portion having a chamber therein communicating with said air-passage, and said blank being adapted to be bent into handle form, substantially as described;

ALFRED J. DOUGHTY.

Witnesses:

E. L. ROBISON, H. H. ROBINSON. 

